Looks to be caused by an inflated viral structure left behind by disease. A 8W 1MHz ultrasonic massage unit will clear this stucture of only ½ a minute of High Intensity UltraSound applied to the spine.
The cheapest source is a 8W 1MHz ultrasonic massage device.
Try it – it may work. If not, you have done no harm, but have the device to cure all your infections for ever: via ½ a minute of ultrasound to each sdei of the chest, throat and nose.
Live long and prosper. All Dr.s already have a 8W 3MHz device, which deos the job in 20 seconds: best medicine.